Chemical modification of lactose. VIII. Studies on the reactivities of the secondary hydroxyl groups in 1,6-anhydro-4',6'-O-benzylidene-.BETA.-lactose by selective p-toluenesulfonylation.
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Selective tosylation of 1, 6-anhydro-4', 6'-O-benzylidene-β-lactose (1), using 2.2 molar equivalents of tosyl chloride in pyridine at 0°, yielded four tosylates which were designated 2 to 5 in the order of decreasing Rf value on thin-layer chromatography. After column chromatography on silica gel, compounds 2-5 were separated as the 2, 3, 3'-tritosylate (2, 1.3%), 2, 3'-ditosylate (3, 21.9%), 3'-tosylate (4, 15%), and 2-tosylate (5, 25.2%), respectively. Selective tosylation of 3, using 8 molar equivalents of tosyl chloride afforded 2 (29%), 15, and 16, together with 3 (15%). Compounds 15 and 16 were identified as 2, 2', 3, 3'-tetratosylate (15, 38.9%) and 2, 2', 3'-tritosylate (16, 17.1%), respectively. Thus, the order of reactivities of the secondary hydroxyl groups in 1 is 2>3'>3>2'. Compounds 2-5 and 16 have potential value in the chemical modification of lactose or the syntheses of lactose-containing oligosaccharides in human milk.
収録刊行物
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- CHEMICAL & PHARMACEUTICAL BULLETIN
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CHEMICAL & PHARMACEUTICAL BULLETIN 26 (4), 1117-1122, 1978
公益社団法人 日本薬学会
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詳細情報 詳細情報について
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- CRID
- 1390001204168729088
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- NII論文ID
- 110003623099
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- NII書誌ID
- AA00602100
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- COI
- 1:CAS:528:DyaE1cXltFSitbs%3D
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- ISSN
- 13475223
- 00092363
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可